Edna Kiplagat had the streets of Boston to herself Monday. Running her first Boston Marathon, the 37-year-old veteran Kenyan racer stayed with the lead pack of women until the 19-mile mark. Then came the Newton hills, and there went Kiplagat, surging ahead with a confident stride. She quickly dusted the competition.

Kiplagat ran Mile 20, an uphill stretch, in 5 minutes, 1 second, the fastest women’s split of the day, and after that, she quickly ran away from her last chasers, Rose Chelimo of Bahrain and American Jordan Hasay, to rush across the line in 2:21:52.

Chelimo, eighth in the Olympic marathon in Rio, was second in 2:22:51. Hasay, a 25-year-old also running her debut, held on for third in 2:23:00, breaking the record for a debut marathon by an American woman.